1 /* 2 * $OpenBSD: patch.c,v 1.45 2007/04/18 21:52:24 sobrado Exp $ 3 * $DragonFly: src/usr.bin/patch/patch.c,v 1.10 2008/08/10 23:39:56 joerg Exp $ 4 * $NetBSD: patch.c,v 1.33 2021/09/20 23:22:36 dholland Exp $ 5 */ 6 7 /* 8 * patch - a program to apply diffs to original files 9 * 10 * Copyright 1986, Larry Wall 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following condition is met: 14 * 1. Redistributions of source code must retain the above copyright notice, 15 * this condition and the following disclaimer. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 30 * behaviour 31 */ 32 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: patch.c,v 1.33 2021/09/20 23:22:36 dholland Exp $"); 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <getopt.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "pch.h" 50 #include "inp.h" 51 #include "backupfile.h" 52 #include "pathnames.h" 53 54 mode_t filemode = 0644; 55 56 char *buf; /* general purpose buffer */ 57 size_t bufsz; /* general purpose buffer size */ 58 59 bool using_plan_a = true; /* try to keep everything in memory */ 60 bool out_of_mem = false; /* ran out of memory in plan a */ 61 62 #define MAXFILEC 2 63 64 char *filearg[MAXFILEC]; 65 bool ok_to_create_file = false; 66 char *outname = NULL; 67 char *origprae = NULL; 68 char *TMPOUTNAME; 69 char *TMPINNAME; 70 char *TMPREJNAME; 71 char *TMPPATNAME; 72 bool toutkeep = false; 73 bool trejkeep = false; 74 bool warn_on_invalid_line; 75 bool last_line_missing_eol; 76 77 #ifdef DEBUGGING 78 int debug = 0; 79 #endif 80 81 bool force = false; 82 bool batch = false; 83 bool verbose = true; 84 bool reverse = false; 85 bool noreverse = false; 86 bool skip_rest_of_patch = false; 87 int strippath = 957; 88 bool canonicalize = false; 89 bool check_only = false; 90 int diff_type = 0; 91 char *revision = NULL; /* prerequisite revision, if any */ 92 LINENUM input_lines = 0; /* how long is input file in lines */ 93 int posix = 0; /* strict POSIX mode? */ 94 95 static void reinitialize_almost_everything(void); 96 static void get_some_switches(void); 97 static LINENUM locate_hunk(LINENUM); 98 static void abort_context_hunk(void); 99 static void rej_line(int, LINENUM); 100 static void abort_hunk(void); 101 static void apply_hunk(LINENUM); 102 static void init_output(const char *); 103 static void init_reject(const char *); 104 static void copy_till(LINENUM, bool); 105 static bool spew_output(void); 106 static void dump_line(LINENUM, bool); 107 static bool patch_match(LINENUM, LINENUM, LINENUM); 108 static bool similar(const char *, const char *, int); 109 __dead static void usage(void); 110 111 /* true if -E was specified on command line. */ 112 static bool remove_empty_files = false; 113 114 /* true if -R was specified on command line. */ 115 static bool reverse_flag_specified = false; 116 117 /* buffer holding the name of the rejected patch file. */ 118 static char rejname[PATH_MAX]; 119 120 /* buffer for stderr */ 121 static char serrbuf[BUFSIZ]; 122 123 /* how many input lines have been irretractibly output */ 124 static LINENUM last_frozen_line = 0; 125 126 static int Argc; /* guess */ 127 static char **Argv; 128 static int Argc_last; /* for restarting plan_b */ 129 static char **Argv_last; 130 131 static FILE *ofp = NULL; /* output file pointer */ 132 static FILE *rejfp = NULL; /* reject file pointer */ 133 134 static int filec = 0; /* how many file arguments? */ 135 static LINENUM last_offset = 0; 136 static LINENUM maxfuzz = 2; 137 138 /* patch using ifdef, ifndef, etc. */ 139 static bool do_defines = false; 140 /* #ifdef xyzzy */ 141 static char if_defined[128]; 142 /* #ifndef xyzzy */ 143 static char not_defined[128]; 144 /* #else */ 145 static const char else_defined[] = "#else\n"; 146 /* #endif xyzzy */ 147 static char end_defined[128]; 148 149 150 /* Apply a set of diffs as appropriate. */ 151 152 int 153 main(int argc, char *argv[]) 154 { 155 int error = 0, hunk, failed, i, fd; 156 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 157 const char *tmpdir; 158 char *v; 159 160 bufsz = INITLINELEN; 161 if ((buf = malloc(bufsz)) == NULL) 162 pfatal("allocating input buffer"); 163 buf[0] = '\0'; 164 165 setbuf(stderr, serrbuf); 166 for (i = 0; i < MAXFILEC; i++) 167 filearg[i] = NULL; 168 169 /* Cons up the names of the temporary files. */ 170 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 171 tmpdir = _PATH_TMP; 172 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 173 ; 174 i++; 175 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPOUTNAME)) < 0) 178 pfatal("can't create %s", TMPOUTNAME); 179 close(fd); 180 181 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPINNAME)) < 0) 184 pfatal("can't create %s", TMPINNAME); 185 close(fd); 186 187 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 188 fatal("cannot allocate memory"); 189 if ((fd = mkstemp(TMPREJNAME)) < 0) 190 pfatal("can't create %s", TMPREJNAME); 191 close(fd); 192 193 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 194 fatal("cannot allocate memory"); 195 if ((fd = mkstemp(TMPPATNAME)) < 0) 196 pfatal("can't create %s", TMPPATNAME); 197 close(fd); 198 199 v = getenv("SIMPLE_BACKUP_SUFFIX"); 200 if (v) 201 simple_backup_suffix = v; 202 else 203 simple_backup_suffix = ORIGEXT; 204 205 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 206 v = getenv("VERSION_CONTROL"); 207 if (v != NULL) 208 backup_type = get_version(v); 209 210 /* parse switches */ 211 Argc = argc; 212 Argv = argv; 213 get_some_switches(); 214 215 if (backup_type == undefined) 216 backup_type = posix ? none : numbered_existing; 217 218 /* make sure we clean up /tmp in case of disaster */ 219 set_signals(0); 220 221 for (open_patch_file(filearg[1]); there_is_another_patch(); 222 reinitialize_almost_everything()) { 223 /* for each patch in patch file */ 224 225 warn_on_invalid_line = true; 226 227 if (outname == NULL) 228 outname = savestr(filearg[0]); 229 230 /* for ed script just up and do it and exit */ 231 if (diff_type == ED_DIFF) { 232 do_ed_script(); 233 continue; 234 } 235 /* initialize the patched file */ 236 if (!skip_rest_of_patch) 237 init_output(TMPOUTNAME); 238 239 /* initialize reject file */ 240 init_reject(TMPREJNAME); 241 242 /* find out where all the lines are */ 243 if (!skip_rest_of_patch) 244 scan_input(filearg[0]); 245 246 /* from here on, open no standard i/o files, because malloc */ 247 /* might misfire and we can't catch it easily */ 248 249 /* apply each hunk of patch */ 250 hunk = 0; 251 failed = 0; 252 out_of_mem = false; 253 while (another_hunk()) { 254 hunk++; 255 fuzz = 0; 256 mymaxfuzz = pch_context(); 257 if (maxfuzz < mymaxfuzz) 258 mymaxfuzz = maxfuzz; 259 if (!skip_rest_of_patch) { 260 do { 261 where = locate_hunk(fuzz); 262 if (hunk == 1 && where == 0 && !force) { 263 /* dwim for reversed patch? */ 264 if (!pch_swap()) { 265 if (fuzz == 0) 266 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 267 continue; 268 } 269 reverse = !reverse; 270 /* try again */ 271 where = locate_hunk(fuzz); 272 if (where == 0) { 273 /* didn't find it swapped */ 274 if (!pch_swap()) 275 /* put it back to normal */ 276 fatal("lost hunk on alloc error!\n"); 277 reverse = !reverse; 278 } else if (noreverse) { 279 if (!pch_swap()) 280 /* put it back to normal */ 281 fatal("lost hunk on alloc error!\n"); 282 reverse = !reverse; 283 say("Ignoring previously applied (or reversed) patch.\n"); 284 skip_rest_of_patch = true; 285 } else if (batch) { 286 if (verbose) 287 say("%seversed (or %spreviously applied) patch detected! %s -R.", 288 reverse ? "R" : "Unr", 289 reverse ? "" : "not ", 290 reverse ? "Assuming" : "Ignoring"); 291 } else { 292 ask("%seversed (or %spreviously applied) patch detected! %s -R? [y] ", 293 reverse ? "R" : "Unr", 294 reverse ? "" : "not ", 295 reverse ? "Assume" : "Ignore"); 296 if (*buf == 'n') { 297 ask("Apply anyway? [n] "); 298 if (*buf != 'y') 299 skip_rest_of_patch = true; 300 where = 0; 301 reverse = !reverse; 302 if (!pch_swap()) 303 /* put it back to normal */ 304 fatal("lost hunk on alloc error!\n"); 305 } 306 } 307 } 308 } while (!skip_rest_of_patch && where == 0 && 309 ++fuzz <= mymaxfuzz); 310 311 if (skip_rest_of_patch) { /* just got decided */ 312 if (ferror(ofp) || fclose(ofp)) { 313 say("Error writing %s\n", 314 TMPOUTNAME); 315 error = 1; 316 } 317 ofp = NULL; 318 } 319 } 320 newwhere = pch_newfirst() + last_offset; 321 if (skip_rest_of_patch) { 322 abort_hunk(); 323 failed++; 324 if (verbose) 325 say("Hunk #%d ignored at %ld.\n", 326 hunk, newwhere); 327 } else if (where == 0) { 328 abort_hunk(); 329 failed++; 330 if (verbose) 331 say("Hunk #%d failed at %ld.\n", 332 hunk, newwhere); 333 } else { 334 apply_hunk(where); 335 if (verbose) { 336 say("Hunk #%d succeeded at %ld", 337 hunk, newwhere); 338 if (fuzz != 0) 339 say(" with fuzz %ld", fuzz); 340 if (last_offset) 341 say(" (offset %ld line%s)", 342 last_offset, 343 last_offset == 1L ? "" : "s"); 344 say(".\n"); 345 } 346 } 347 } 348 349 if (out_of_mem && using_plan_a) { 350 Argc = Argc_last; 351 Argv = Argv_last; 352 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 353 if (ofp) 354 fclose(ofp); 355 ofp = NULL; 356 if (rejfp) 357 fclose(rejfp); 358 rejfp = NULL; 359 continue; 360 } 361 if (hunk == 0) 362 fatal("Internal error: hunk should not be 0\n"); 363 364 /* finish spewing out the new file */ 365 if (!skip_rest_of_patch && !spew_output()) { 366 say("Can't write %s\n", TMPOUTNAME); 367 error = 1; 368 } 369 370 /* and put the output where desired */ 371 ignore_signals(); 372 if (!skip_rest_of_patch) { 373 struct stat statbuf; 374 char *realout = outname; 375 376 if (!check_only) { 377 if (move_file(TMPOUTNAME, outname) < 0) { 378 toutkeep = true; 379 realout = TMPOUTNAME; 380 chmod(TMPOUTNAME, filemode); 381 } else 382 chmod(outname, filemode); 383 384 if (remove_empty_files && 385 stat(realout, &statbuf) == 0 && 386 statbuf.st_size == 0) { 387 if (verbose) 388 say("Removing %s (empty after patching).\n", 389 realout); 390 unlink(realout); 391 } 392 } 393 } 394 if (ferror(rejfp) || fclose(rejfp)) { 395 say("Error writing %s\n", rejname); 396 error = 1; 397 } 398 rejfp = NULL; 399 if (failed) { 400 error = 1; 401 if (*rejname == '\0') { 402 if (strlcpy(rejname, outname, 403 sizeof(rejname)) >= sizeof(rejname)) 404 fatal("filename %s is too long\n", outname); 405 if (strlcat(rejname, REJEXT, 406 sizeof(rejname)) >= sizeof(rejname)) 407 fatal("filename %s is too long\n", outname); 408 } 409 if (skip_rest_of_patch) { 410 say("%d out of %d hunks ignored--saving rejects to %s\n", 411 failed, hunk, rejname); 412 } else { 413 say("%d out of %d hunks failed--saving rejects to %s\n", 414 failed, hunk, rejname); 415 } 416 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 417 trejkeep = true; 418 } 419 set_signals(1); 420 } 421 my_exit(error); 422 /* NOTREACHED */ 423 } 424 425 /* Prepare to find the next patch to do in the patch file. */ 426 427 static void 428 reinitialize_almost_everything(void) 429 { 430 re_patch(); 431 re_input(); 432 433 input_lines = 0; 434 last_frozen_line = 0; 435 436 filec = 0; 437 if (!out_of_mem) { 438 free(filearg[0]); 439 filearg[0] = NULL; 440 } 441 442 free(outname); 443 outname = NULL; 444 445 last_offset = 0; 446 diff_type = 0; 447 448 free(revision); 449 revision = NULL; 450 451 reverse = reverse_flag_specified; 452 skip_rest_of_patch = false; 453 454 get_some_switches(); 455 } 456 457 /* Process switches and filenames. */ 458 459 static void 460 get_some_switches(void) 461 { 462 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 463 static struct option longopts[] = { 464 {"backup", no_argument, 0, 'b'}, 465 {"batch", no_argument, 0, 't'}, 466 {"check", no_argument, 0, 'C'}, 467 {"context", no_argument, 0, 'c'}, 468 {"debug", required_argument, 0, 'x'}, 469 {"directory", required_argument, 0, 'd'}, 470 {"ed", no_argument, 0, 'e'}, 471 {"force", no_argument, 0, 'f'}, 472 {"forward", no_argument, 0, 'N'}, 473 {"fuzz", required_argument, 0, 'F'}, 474 {"ifdef", required_argument, 0, 'D'}, 475 {"input", required_argument, 0, 'i'}, 476 {"ignore-whitespace", no_argument, 0, 'l'}, 477 {"normal", no_argument, 0, 'n'}, 478 {"output", required_argument, 0, 'o'}, 479 {"prefix", required_argument, 0, 'B'}, 480 {"quiet", no_argument, 0, 's'}, 481 {"reject-file", required_argument, 0, 'r'}, 482 {"remove-empty-files", no_argument, 0, 'E'}, 483 {"reverse", no_argument, 0, 'R'}, 484 {"silent", no_argument, 0, 's'}, 485 {"strip", required_argument, 0, 'p'}, 486 {"suffix", required_argument, 0, 'z'}, 487 {"unified", no_argument, 0, 'u'}, 488 {"version", no_argument, 0, 'v'}, 489 {"version-control", required_argument, 0, 'V'}, 490 {"posix", no_argument, &posix, 1}, 491 {NULL, 0, 0, 0} 492 }; 493 int ch; 494 495 rejname[0] = '\0'; 496 Argc_last = Argc; 497 Argv_last = Argv; 498 if (!Argc) 499 return; 500 optreset = optind = 1; 501 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 502 switch (ch) { 503 case 'b': 504 if (backup_type == undefined) 505 backup_type = numbered_existing; 506 if (optarg == NULL) 507 break; 508 if (verbose) 509 say("Warning, the ``-b suffix'' option has been" 510 " obsoleted by the -z option.\n"); 511 /* FALLTHROUGH */ 512 case 'z': 513 /* must directly follow 'b' case for backwards compat */ 514 simple_backup_suffix = savestr(optarg); 515 break; 516 case 'B': 517 origprae = savestr(optarg); 518 break; 519 case 'c': 520 diff_type = CONTEXT_DIFF; 521 break; 522 case 'C': 523 check_only = true; 524 break; 525 case 'd': 526 if (chdir(optarg) < 0) 527 pfatal("can't cd to %s", optarg); 528 break; 529 case 'D': 530 do_defines = true; 531 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 532 fatal("argument to -D is not an identifier\n"); 533 snprintf(if_defined, sizeof if_defined, 534 "#ifdef %s\n", optarg); 535 snprintf(not_defined, sizeof not_defined, 536 "#ifndef %s\n", optarg); 537 snprintf(end_defined, sizeof end_defined, 538 "#endif /* %s */\n", optarg); 539 break; 540 case 'e': 541 diff_type = ED_DIFF; 542 break; 543 case 'E': 544 remove_empty_files = true; 545 break; 546 case 'f': 547 force = true; 548 break; 549 case 'F': 550 maxfuzz = atoi(optarg); 551 break; 552 case 'i': 553 if (++filec == MAXFILEC) 554 fatal("too many file arguments\n"); 555 filearg[filec] = savestr(optarg); 556 break; 557 case 'l': 558 canonicalize = true; 559 break; 560 case 'n': 561 diff_type = NORMAL_DIFF; 562 break; 563 case 'N': 564 noreverse = true; 565 break; 566 case 'o': 567 outname = savestr(optarg); 568 break; 569 case 'p': 570 strippath = atoi(optarg); 571 break; 572 case 'r': 573 if (strlcpy(rejname, optarg, 574 sizeof(rejname)) >= sizeof(rejname)) 575 fatal("argument for -r is too long\n"); 576 break; 577 case 'R': 578 reverse = true; 579 reverse_flag_specified = true; 580 break; 581 case 's': 582 verbose = false; 583 break; 584 case 't': 585 batch = true; 586 break; 587 case 'u': 588 diff_type = UNI_DIFF; 589 break; 590 case 'v': 591 version(); 592 break; 593 case 'V': 594 backup_type = get_version(optarg); 595 break; 596 #ifdef DEBUGGING 597 case 'x': 598 debug = atoi(optarg); 599 break; 600 #endif 601 default: 602 if (ch != '\0') 603 usage(); 604 break; 605 } 606 } 607 Argc -= optind; 608 Argv += optind; 609 610 if (Argc > 0) { 611 filearg[0] = savestr(*Argv++); 612 Argc--; 613 while (Argc > 0) { 614 if (++filec == MAXFILEC) 615 fatal("too many file arguments\n"); 616 filearg[filec] = savestr(*Argv++); 617 Argc--; 618 } 619 } 620 621 if (getenv("POSIXLY_CORRECT") != NULL) 622 posix = 1; 623 } 624 625 static void 626 usage(void) 627 { 628 fprintf(stderr, 629 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 630 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 631 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 632 " [--posix] [origfile [patchfile]]\n" 633 " patch <patchfile\n"); 634 my_exit(EXIT_FAILURE); 635 } 636 637 /* 638 * Attempt to find the right place to apply this hunk of patch. 639 */ 640 static LINENUM 641 locate_hunk(LINENUM fuzz) 642 { 643 LINENUM first_guess = pch_first() + last_offset; 644 LINENUM offset; 645 LINENUM pat_lines = pch_ptrn_lines(); 646 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 647 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 648 649 if (pat_lines == 0) { /* null range matches always */ 650 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 651 || diff_type == NEW_CONTEXT_DIFF 652 || diff_type == UNI_DIFF)) { 653 say("Empty context always matches.\n"); 654 } 655 return (first_guess); 656 } 657 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 658 max_neg_offset = first_guess - 1; 659 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 660 return first_guess; 661 for (offset = 1; ; offset++) { 662 bool check_after = (offset <= max_pos_offset); 663 bool check_before = (offset <= max_neg_offset); 664 665 if (check_after && patch_match(first_guess, offset, fuzz)) { 666 #ifdef DEBUGGING 667 if (debug & 1) 668 say("Offset changing from %ld to %ld\n", 669 last_offset, offset); 670 #endif 671 last_offset = offset; 672 return first_guess + offset; 673 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 674 #ifdef DEBUGGING 675 if (debug & 1) 676 say("Offset changing from %ld to %ld\n", 677 last_offset, -offset); 678 #endif 679 last_offset = -offset; 680 return first_guess - offset; 681 } else if (!check_before && !check_after) 682 return 0; 683 } 684 } 685 686 /* We did not find the pattern, dump out the hunk so they can handle it. */ 687 688 static void 689 abort_context_hunk(void) 690 { 691 LINENUM i; 692 const LINENUM pat_end = pch_end(); 693 /* 694 * add in last_offset to guess the same as the previous successful 695 * hunk 696 */ 697 const LINENUM oldfirst = pch_first() + last_offset; 698 const LINENUM newfirst = pch_newfirst() + last_offset; 699 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 700 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 701 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 702 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 703 704 fprintf(rejfp, "***************\n"); 705 for (i = 0; i <= pat_end; i++) { 706 switch (pch_char(i)) { 707 case '*': 708 if (oldlast < oldfirst) 709 fprintf(rejfp, "*** 0%s\n", stars); 710 else if (oldlast == oldfirst) 711 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 712 else 713 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 714 oldlast, stars); 715 break; 716 case '=': 717 if (newlast < newfirst) 718 fprintf(rejfp, "--- 0%s\n", minuses); 719 else if (newlast == newfirst) 720 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 721 else 722 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 723 newlast, minuses); 724 break; 725 case '\n': 726 fprintf(rejfp, "%s", pfetch(i)); 727 break; 728 case ' ': 729 case '-': 730 case '+': 731 case '!': 732 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 733 break; 734 default: 735 fatal("fatal internal error in abort_context_hunk\n"); 736 } 737 } 738 } 739 740 static void 741 rej_line(int ch, LINENUM i) 742 { 743 size_t len; 744 const char *line = pfetch(i); 745 746 len = strlen(line); 747 748 fprintf(rejfp, "%c%s", ch, line); 749 if (len == 0 || line[len-1] != '\n') 750 fprintf(rejfp, "\n\\ No newline at end of file\n"); 751 } 752 753 static void 754 abort_hunk(void) 755 { 756 LINENUM i, j, split; 757 int ch1, ch2; 758 const LINENUM pat_end = pch_end(); 759 const LINENUM oldfirst = pch_first() + last_offset; 760 const LINENUM newfirst = pch_newfirst() + last_offset; 761 762 if (diff_type != UNI_DIFF) { 763 abort_context_hunk(); 764 return; 765 } 766 split = -1; 767 for (i = 0; i <= pat_end; i++) { 768 if (pch_char(i) == '=') { 769 split = i; 770 break; 771 } 772 } 773 if (split == -1) { 774 fprintf(rejfp, "malformed hunk: no split found\n"); 775 return; 776 } 777 i = 0; 778 j = split + 1; 779 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 780 pch_ptrn_lines() ? oldfirst : 0, 781 pch_ptrn_lines(), newfirst, pch_repl_lines()); 782 while (i < split || j <= pat_end) { 783 ch1 = i < split ? pch_char(i) : -1; 784 ch2 = j <= pat_end ? pch_char(j) : -1; 785 if (ch1 == '-') { 786 rej_line('-', i); 787 i++; 788 } else if (ch1 == ' ' && ch2 == ' ') { 789 rej_line(' ', i); 790 i++; 791 j++; 792 } else if (ch1 == '!' && ch2 == '!') { 793 while (i < split && ch1 == '!') { 794 rej_line('-', i); 795 i++; 796 ch1 = i < split ? pch_char(i) : -1; 797 } 798 while (j <= pat_end && ch2 == '!') { 799 rej_line('+', j); 800 j++; 801 ch2 = j <= pat_end ? pch_char(j) : -1; 802 } 803 } else if (ch1 == '*') { 804 i++; 805 } else if (ch2 == '+' || ch2 == ' ') { 806 rej_line(ch2, j); 807 j++; 808 } else { 809 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 810 i, split, j); 811 rej_line(ch1, i); 812 rej_line(ch2, j); 813 return; 814 } 815 } 816 } 817 818 /* We found where to apply it (we hope), so do it. */ 819 820 static void 821 apply_hunk(LINENUM where) 822 { 823 LINENUM old = 1; 824 const LINENUM lastline = pch_ptrn_lines(); 825 LINENUM new = lastline + 1; 826 #define OUTSIDE 0 827 #define IN_IFNDEF 1 828 #define IN_IFDEF 2 829 #define IN_ELSE 3 830 int def_state = OUTSIDE; 831 const LINENUM pat_end = pch_end(); 832 833 where--; 834 while (pch_char(new) == '=' || pch_char(new) == '\n') 835 new++; 836 837 while (old <= lastline) { 838 if (pch_char(old) == '-') { 839 copy_till(where + old - 1, false); 840 if (do_defines) { 841 if (def_state == OUTSIDE) { 842 fputs(not_defined, ofp); 843 def_state = IN_IFNDEF; 844 } else if (def_state == IN_IFDEF) { 845 fputs(else_defined, ofp); 846 def_state = IN_ELSE; 847 } 848 fputs(pfetch(old), ofp); 849 } 850 last_frozen_line++; 851 old++; 852 } else if (new > pat_end) { 853 break; 854 } else if (pch_char(new) == '+') { 855 copy_till(where + old - 1, false); 856 if (do_defines) { 857 if (def_state == IN_IFNDEF) { 858 fputs(else_defined, ofp); 859 def_state = IN_ELSE; 860 } else if (def_state == OUTSIDE) { 861 fputs(if_defined, ofp); 862 def_state = IN_IFDEF; 863 } 864 } 865 fputs(pfetch(new), ofp); 866 new++; 867 } else if (pch_char(new) != pch_char(old)) { 868 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 869 pch_hunk_beg() + old, 870 pch_hunk_beg() + new); 871 #ifdef DEBUGGING 872 say("oldchar = '%c', newchar = '%c'\n", 873 pch_char(old), pch_char(new)); 874 #endif 875 my_exit(2); 876 } else if (pch_char(new) == '!') { 877 copy_till(where + old - 1, false); 878 if (do_defines) { 879 fputs(not_defined, ofp); 880 def_state = IN_IFNDEF; 881 } 882 while (pch_char(old) == '!') { 883 if (do_defines) { 884 fputs(pfetch(old), ofp); 885 } 886 last_frozen_line++; 887 old++; 888 } 889 if (do_defines) { 890 fputs(else_defined, ofp); 891 def_state = IN_ELSE; 892 } 893 while (pch_char(new) == '!') { 894 fputs(pfetch(new), ofp); 895 new++; 896 } 897 } else { 898 if (pch_char(new) != ' ') 899 fatal("Internal error: expected ' '\n"); 900 old++; 901 new++; 902 if (do_defines && def_state != OUTSIDE) { 903 fputs(end_defined, ofp); 904 def_state = OUTSIDE; 905 } 906 } 907 } 908 if (new <= pat_end && pch_char(new) == '+') { 909 copy_till(where + old - 1, false); 910 if (do_defines) { 911 if (def_state == OUTSIDE) { 912 fputs(if_defined, ofp); 913 def_state = IN_IFDEF; 914 } else if (def_state == IN_IFNDEF) { 915 fputs(else_defined, ofp); 916 def_state = IN_ELSE; 917 } 918 } 919 while (new <= pat_end && pch_char(new) == '+') { 920 fputs(pfetch(new), ofp); 921 new++; 922 } 923 } 924 if (do_defines && def_state != OUTSIDE) { 925 fputs(end_defined, ofp); 926 } 927 } 928 929 /* 930 * Open the new file. 931 */ 932 static void 933 init_output(const char *name) 934 { 935 ofp = fopen(name, "w"); 936 if (ofp == NULL) 937 pfatal("can't create %s", name); 938 } 939 940 /* 941 * Open a file to put hunks we can't locate. 942 */ 943 static void 944 init_reject(const char *name) 945 { 946 rejfp = fopen(name, "w"); 947 if (rejfp == NULL) 948 pfatal("can't create %s", name); 949 } 950 951 /* 952 * Copy input file to output, up to wherever hunk is to be applied. 953 * If endoffile is true, treat the last line specially since it may 954 * lack a newline. 955 */ 956 static void 957 copy_till(LINENUM lastline, bool endoffile) 958 { 959 if (last_frozen_line > lastline) 960 fatal("misordered hunks! output would be garbled\n"); 961 while (last_frozen_line < lastline) { 962 if (++last_frozen_line == lastline && endoffile) 963 dump_line(last_frozen_line, !last_line_missing_eol); 964 else 965 dump_line(last_frozen_line, true); 966 } 967 } 968 969 /* 970 * Finish copying the input file to the output file. 971 */ 972 static bool 973 spew_output(void) 974 { 975 int rv; 976 977 #ifdef DEBUGGING 978 if (debug & 256) 979 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 980 #endif 981 if (input_lines) 982 copy_till(input_lines, true); /* dump remainder of file */ 983 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 984 ofp = NULL; 985 return rv; 986 } 987 988 /* 989 * Copy one line from input to output. 990 */ 991 static void 992 dump_line(LINENUM line, bool write_newline) 993 { 994 char *s; 995 996 s = ifetch(line, 0); 997 if (s == NULL) 998 return; 999 /* Note: string is not NUL terminated. */ 1000 for (; *s != '\n'; s++) 1001 putc(*s, ofp); 1002 if (write_newline) 1003 putc('\n', ofp); 1004 } 1005 1006 /* 1007 * Does the patch pattern match at line base+offset? 1008 */ 1009 static bool 1010 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1011 { 1012 LINENUM pline = 1 + fuzz; 1013 LINENUM iline; 1014 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1015 const char *ilineptr; 1016 const char *plineptr; 1017 short plinelen; 1018 1019 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1020 ilineptr = ifetch(iline, offset >= 0); 1021 if (ilineptr == NULL) 1022 return false; 1023 plineptr = pfetch(pline); 1024 plinelen = pch_line_len(pline); 1025 if (canonicalize) { 1026 if (!similar(ilineptr, plineptr, plinelen)) 1027 return false; 1028 } else if (strnNE(ilineptr, plineptr, plinelen)) 1029 return false; 1030 if (iline == input_lines) { 1031 /* 1032 * We are looking at the last line of the file. 1033 * If the file has no eol, the patch line should 1034 * not have one either and vice-versa. Note that 1035 * plinelen > 0. 1036 */ 1037 if (last_line_missing_eol) { 1038 if (plineptr[plinelen - 1] == '\n') 1039 return false; 1040 } else { 1041 if (plineptr[plinelen - 1] != '\n') 1042 return false; 1043 } 1044 } 1045 } 1046 return true; 1047 } 1048 1049 /* 1050 * Do two lines match with canonicalized white space? 1051 */ 1052 static bool 1053 similar(const char *a, const char *b, int len) 1054 { 1055 while (len) { 1056 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1057 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1058 return false; 1059 while (len && isspace((unsigned char)*b) && *b != '\n') 1060 b++, len--; /* skip pattern whitespace */ 1061 while (isspace((unsigned char)*a) && *a != '\n') 1062 a++; /* skip target whitespace */ 1063 if (*a == '\n' || *b == '\n') 1064 return (*a == *b); /* should end in sync */ 1065 } else if (*a++ != *b++) /* match non-whitespace chars */ 1066 return false; 1067 else 1068 len--; /* probably not necessary */ 1069 } 1070 return true; /* actually, this is not reached */ 1071 /* since there is always a \n */ 1072 } 1073